Recent content by BayouRadioAmplifier

no telling how your amp is different than that schematic, and the amp here in town that I worked on. (I never want to work on it again!) but off of the negative side of the HV capacitor board, a 10 ohm 10W going to ground. It acts as a little "cushion" when powering up, and also can blow as a...

I worked on one of these monsters. it is still going strong, down the road from me. 1. - the RF key-up circuit was bad. 2. - the design, or the wiring around the driver tube needed corrections. and yes, no HV to the tubes. a few times. if the breaker trips, from the tubes, or an arc...

yes, I quit a part-time job at that Tractor Supply place a few weeks ago. I loaned some money to a "Team Leader" there, and found out he is into the pills. he said his electricity was being cut off, and also being evicted. all the lies. calling me up at 3 in the morning, all high, for...

I was just using a DX 250 here that had troubles, after the transistors were changed to HG C2290s. Oscillation troubles after un-keying. found problem in the feedback circuit at resistors R9 / R6. They put too high a value in. but the RF input resistor attenuation networks change, in AM, SSB...

sounds like problems in the PLL. not working, not locking up on frequency. that PLL is big, with discrete components,

PLL problems! fun! fun! drinking a few Guinness' here and downloaded this schematic. I watched the video. I noticed TP2 voltage never goes up much over 3.2V it should lock up at times to over 5 volts while messing with L17, to pull the VCO freq up higher. it is best viewed with an...

I have messed with these sometimes very noisy, and sometimes distorted in SSB, receivers. I have read the complaints of "white noise" check the AM USB LSB OSC frequencies. in SSB receive, after the 10.695 filter the signal goes through more amplifier circuitry with tuned input and output...

I was not clear here - I meant. Q39 shorts out and kills the audio input from the MIC audio, as it should, when triggered But I am not sure if what you mentioned is an error in the drawing.

I have looked at that section of the MIC audio line before. Q39 killing the MIC audio input. Not sure if that is a mistake. usually the AMC/ALC is disabled on all the radios I ever worked on. But, I have seen other mistakes in RCI/Galaxy schematics. such at the PLL circuit, to the varicap...

drinking my morning coffee here, do as mentioned above. I was given a 2000 about two weeks ago with this same problem, TR36 blowing out. there was about 10 volts at TR36-base. but I could adjust the voltage at TR37-base to proper levels. so cut out capacitor C152. it was leaking DC...

just checked the posting here, and SuperLid just asked a great question "Where did you get the final and drivers from" I recently had good results using the HQ made transistors from that Fat Boy guy in New Jersey.

woaa! you replaced all that! but can you adjust VR10/11 for the bias there? the finals? as brandon said, "in SSB (with mic gain minimum)" key up. check the 8V that supplies the bias R243/R245 junction to ground. check the voltage at base of Q47/48/49 for around .65 the voltage at the...

again - just drinking my morning coffee here, and took a peek at the schematic. TP9 is at the signal path on the way to the transmitter RF amplifier output circuitry. I would say this test point is used at the factory when the new radio is tuned up, L40/42/43/44 around mixer IC9. Everything...

drinking my morning coffee. found the amp you are talking about. EPAC10010B or maybe 10010D, as also in the Galaxy DX-94HP 4 IRF520's. that bias procedure is for the main board. TP7 VR13 just like most of them other IRF520 RF AMP radios. for your external amp, since you worked on it...

so are you inquiring about that external RF PA with 8 IRF520 MOSFETs? or the main board, usually having 2 or 3 IRF520's. ?